package com.wechat.order.util.signature.rsa;

import org.apache.commons.codec.binary.Hex;

import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * Created by zzy on 2018/1/1.
 */
public class RestfulRsa {

    private static String src="restful.com";

    public static void main(String[] args) {
        jdkRSA();
    }

    public static void jdkRSA(){

        try {
            //1、初始化密钥
            KeyPairGenerator keyPairGenerator=KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair=keyPairGenerator.generateKeyPair();
            RSAPublicKey rsaPublicKey= (RSAPublicKey) keyPair.getPublic();
            RSAPrivateKey rsaPrivateKey= (RSAPrivateKey) keyPair.getPrivate();

            //2、执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec=new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
            KeyFactory keyFactory=KeyFactory.getInstance("RSA");
            PrivateKey privateKey= keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature=Signature.getInstance("MD5withRSA");
            signature.initSign(privateKey);
            signature.update(src.getBytes());
            byte[] result= signature.sign();
            System.out.println("jdk rsa sign:"+ Hex.encodeHexString(result));


            //3、签名验证
            X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(rsaPublicKey.getEncoded());
            keyFactory=KeyFactory.getInstance("RSA");
            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);
            signature=Signature.getInstance("MD5withRSA");
            signature.initVerify(publicKey);
            signature.update(src.getBytes());
            boolean bool=  signature.verify(result);
            System.out.println("jdk rsa verify:"+bool);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}
